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Let a thousand string concatenations bloom

How many different ways (in PHP) are there to concatenate the string values in two variables and put the result in a third variable?

Here are a few to start:

I would say something like “Of course, this entire exercise is just for fun and in practice is totally useless,” but whenever I start out thinking that something actually productive eventually emerges. So perhaps this is totally useless, perhaps not!

Tagged with software , php , fun